class _PageState extends State&lt;RouterParam&gt; {
	@override
	Widget build(BuildContext context) {
		return Scaffold(
		    body: ListView(
				padding:EdgeInsets.all(10.0),
				children: <Widget>[
					<em># widget =  RouterParam(title:'',list:[ ],map:{ })</em>
					Text(<b>widget</b>.title),
					Text(<b>widget</b>.list.toString()),
					Text(<b>widget</b>.map.toString()),
				],
			)
		);
	}
}